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Rate of photosynthesis in C3 and C4 at two different (21% and 2% ) O2levels. The rate of photosynthesis or the CO2 assimilation rate (A) was measured at intercellular CO2 concentration of 0, 20, 50, 100 and 200 μmol mol-1 altered at an interval of three minutes. The temperature of the block and the leaf was 28 ± 1°C, relative humidity was maintained at 68 ± 5%, constant light intensity of 1500 μmol m-2 s-1 and the flow rate was maintained at 400 μmol s-1.
